saba: 400; Vollautomatic Stereo

Could these two units, combined together, be used as a stereo decoder for this radio?

kemo-electronic.de/datasheets/m039.pdf - power supply

kemo-electronic.de/datasheets/b127.pdf - stereo deocoder

these two, combined, would replace this,

Fisher MPX 75

It would be used for a SABA (US export version) 400 Automatic Stereo 11, with 7 pin socket for multiplex.

EE Feb 7: No outbound links.

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It's mainly a question of having the correct composite signal level to decoder (baseband L+R, 19kHz pilot tone and 38KHz DSBSC L-R). and not loading the radio set discrimator too much. So at worst you need a FET buffer and attenuator for an IC decoder. A valve (tube) decoder likely just needs connected.

On the L and R decoder output all you need is to make sure the o/p level of decoder suits the Saba inputs.

A suitable PSU for an IC decoder isn't a big issue.

See also this discussion on adding a decoder

I presume the Saba socket has all the signals but that jumper wires or something must need cut. Follow the Saba instructions for the Saba decoder and ensure the decoder input impedance and sensitivity match or are adjusted and the decoder output level is OK.

It's entirely feasible to build an MC1310 IC decoder and PSU into an IFT can and the plug on the bottom so it simply plugs into the Saba decoder option socket with no other connections. It's possible on Stripboard (veroboard) and a homemade plug made out of wire pushed into a piece of margarine tub plastic.

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To make my question a little clearer,

For the US Export SABA 400's, at the audio output of the ratio detector, a 100pf capacitor is placed, to go to pin 3, of the multiplex socket.

Pins 1 and 7, are for the multiplex outputs back to the radio

Pins 5 and 6, are for the filament 6.3V AC

Pin 2 is for ground

If we are adding a power supply that gives us the DC voltage between 4.5 volts and 12 volts.  Will this solid state decoder be able to work in the radio?
 

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Any stereo decoder will work.

But with the IC model you may need a buffer and attenuator. See the other thread.

yes, you need 4.5, 5, 6, 9 , 10 or 12V DC power. If the heater connections are not centre tap earthed, it's even possible to rectify, smooth and regulate the heater voltage to get 5V power using a low drop out regulator. But any DC power, probably more than 50mA to be sure (it doesn't say on the data sheet) between 4.5V and 12 will do. 5V or 9V are convenient.

The Saba dsicriminator o/p is likely expecting at least 100K to 200K load and the IC decoder might be only 20K, but too sensitive. Without knowning which IC is used it's impossible to say. Read the other thread about buffer and attenuator on the IC input.

100pF doesn't sound correct for a series capacitor.

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I have sent an email to KEMO asking for the IC part number, and if they have any knowledge of their product being used in vacuum tube application.

Their directions state, that the input requires a signal of 1V.

It would be nice if the manufacturer of the decoder, had examples of hoe their product can be used.
 

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Dear Omer,

in 2 of your messages, we found out that it was containing an "iframe" pointing to some services of Amazon's CloudFront.

For security reasons, these iframe have been removed.

Please check your PC.

Best regards,

Vincent

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(Sorry if something came along with the last post!)

The manufacturer even suggests, putting the decoder to the mono speaker out, then to hook it to a stereo amp to get FM stereo.

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